CVE WatchJul 31, 2026

CVE-2026-18208

A flaw was found in the OIDC token introspection endpoint of the keycloak-services component. Keycloak is an open-source identity and access

CVSS

6.5

Medium

EPSS

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KEV

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Exploit Today

0-100

Published: Jul 31, 2026 · Last modified: Jul 31, 2026 · CWE-862

EPSS · 30d

Not enough EPSS history yet.

Technical description

A flaw was found in the OIDC token introspection endpoint of the keycloak-services component. Keycloak is an open-source identity and access management solution used to secure modern applications and services. The issue occurs when a confidential client, configured to receive signed JWT introspection responses, attempts to introspect a token issued for a different audience. Although the endpoint correctly identifies the token as inactive for that client, it still returns the full set of token claims within a signed JWT field. This allows an unauthorized client to bypass audience-based restrictions and access sensitive information contained in the token.

Official references

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